Polysilicon purification method and device by reverse induced solidification

A technology of reverse solidification and polycrystalline silicon, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of silicon purity reduction, increase of manufacturing cost, and influence on purification effect, etc., and achieve simple operation, strong controllability, Good purification effect

Inactive Publication Date: 2013-01-02
QINGDAO NEW ENERGY SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, during the heat preservation process of the ingot, the impurities with high content will diffuse to the parts with low impurity content, so that the purity of silicon will gradually decrease with the prolongation of the heat preservation time, which affects the purification effect, and in this case, the excision The tail waste is as high as 25%~35%, that is, the yield is only 65-75%, which causes a great waste of energy and raw materials, and thus increases the manufacturing cost

Method used

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  • Polysilicon purification method and device by reverse induced solidification

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 The equipment for purifying polysilicon by reverse induced solidification is shown as an external structure consisting of a furnace cover 1, a furnace body 4 and a support base 11. The purpose of the rod 13 is to drive the crucible to rotate during the purification process, so that the falling powder is evenly sprinkled on the surface of the melt, and at the same time, the crucible moves downward at a certain speed to pull the ingot. The water-cooled tray 12 plays the role of heat dissipation and support. The cooling plate 10 is fixedly installed above the water-cooling tray 12. Its main purpose is to accelerate the heat dissipation at the bottom of the crucible, so that a temperature gradient is formed between the top and the bottom of the crucible, which facilitates the solidification of the melt at the bottom of the crucible to form an ingot. The solidification and heat preservation device is placed on On the heat dissipation plate 10, the solidifica...

Embodiment 2

[0026] The equipment described in Example 1 is used to perform reverse induced solidification to purify polysilicon. First, the induction coil 8 is used to heat the silicon material in the quartz crucible 5 to 1450° C. to melt it to form a silicon melt, and then the power of the induction coil 8 is adjusted. Small, start the water-cooled rotating rod 13 to move downward to pull the ingot, so that the silicon melt is solidified from the bottom of the quartz crucible 5 to the top. When the solidification reaches 80%, rotate the quartz crucible 5 through the water-cooled rotating rod 13, and open the powder falling device at the same time 2. Scatter the high-purity silicon powder into the upper silicon melt with high impurity content. The high-purity silicon powder is used as a nucleating agent to rapidly reverse the solidification of the upper silicon melt. After the solidification is completed, cut off the part obtained by the reverse solidification of the upper layer , the obta...

Embodiment 3

[0032]The equipment described in Example 1 is used to perform reverse induced solidification to purify polysilicon. First, the induction coil 8 is used to heat the silicon material in the quartz crucible 5 to 1500° C. to melt it to form a silicon melt, and then the power of the induction coil 8 is adjusted. Small, start the water-cooled rotating rod 13 to move downward to pull the ingot, so that the silicon melt is solidified from the bottom of the quartz crucible 5 to the top. When the solidification reaches 85%, rotate the quartz crucible 5 through the water-cooled rotating rod 13, and open the powder falling device at the same time 2. Scatter high-purity silicon powder into the upper silicon melt with high impurity content. The high-purity silicon powder acts as a nucleating agent to rapidly reverse solidify the upper silicon melt. After the solidification is completed, cut off the upper layer and reverse solidify. Part, the obtained lower ingot is the high-purity silicon in...

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Abstract

The invention relates to a polysilicon purification method and a polysilicon purification device by reverse induced solidification, falling into the technical field of metallurgy purification. The method comprises the steps of heating and melting silicon material into molten silicon through an induction coil; reducing power of the induction coil; downwardly pulling ingot through a water-cooled rotation rod to solidify molten silicon from bottom to top; starting a powder spreading device when solidification reaches 80-90%, to spread high-purity silicon powder in the upper layer molten silicon, and realize rapid reverse solidification of the upper layer molten silicon by using the high-purity silicon powder as nucleating agent; cutting off the upper layer reverse-solidified part after complete solidification, and collecting the lower layer casting ingot as high-purity silicon casting ingot. At solidification final stage, by the above rapid reverse solidification of upper layer molten silicon having high impurity content, diffusion of high-content impurities from the upper layer molten silicon toward the solidified low-concentration region during temperature holding process is effectively suppressed, to realize the objective of polysilicon purification by reverse induced solidification.

Description

technical field [0001] The invention belongs to the technical field of metallurgical purification, and in particular relates to a reverse induced solidification purification method, and also relates to its equipment. Background technique [0002] At present, my country has become the world's largest energy production and consumption country, but the per capita energy consumption level is still very low. With the continuous development of the economy and society, my country's energy demand will continue to grow. In response to the current energy shortage, countries around the world are thinking deeply, and are working hard to improve energy efficiency, promote the development and application of renewable energy, and reduce the impact on energy consumption. Reliance on imported oil to enhance energy security. [0003] As one of the important development directions of renewable energy, solar photovoltaic power generation has developed rapidly in recent years, and its proportion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
Inventor 谭毅姜大川
Owner QINGDAO NEW ENERGY SOLUTIONS
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